Regenerative gas reheating-furnace.



No. 767,840. l PATBNTED AUG. 16, 1904, F. SIEMENS.`

RBGBNBRATIVE GAS RBHEATING FURNAGE.

APPLIOATIGN FILED JUNE l5, 1903.

N0 MODEL. I 5 SHEETS-SHEET l.

PATENTED AUG. 16, 1904.

E. SIEMENS.

-REGENERATIVE GAS REHEATING EURNACE.

APPLICATION FILED JUNE 15.1903.

5 SHEETS-SHEET 2.

N0 MODEL.

Maz 66666,

N0. 767,840. PATENTED AUG. 16, 1904.

F. SIEMENS. REGENERATIVE GAS REHEATING FURNAGE.

APBLIOATION FILED JUNE 15. 1903.

No MODEL. 5 SHEETS-SHBET s.

HH DDHH 2.3L; way

No. 767,840. PATENTED AUG. 16, 1904, F. SIEMENS.

REGENERATIVE GAS REHEATING FURNACE. l

APPLICATION FILED JUNE 15, 1903.

NO MODEL. 5 SHEETS-SHEET 4.

y WA i No. 767,840. PATENTED AUG. 16, 1904. E. SIEMENS. REGENERATIVE GASREHEATING EURNACE.

APPLICATION FILED .TUNE 15, 1903.

N0 MODEL. 5 SHEETS-SHEET 5.

Patented August 16, 1904.

PATENT OFFICE.

FREDERICK SIEMENS, OF DRESDEN, GERMANY.

REGENERATIVE GAS REHEATlNG-FURNACE.

SPECIFICATION forming part of Letters Patent No. 767,840, dated August16, 1904,

Application filed June 15,1903x Serial No. 161,572. (No model.)

To (all whom, it may concern,.-

VBe it known that I, FREDERICK SIEMENS, engineer, a subject of the Kingof Saxony, residing at 4 Liebigstrasse, Dresden, in the Empire ofGermany, have invented certain new and useful Improvements inRegenerative Gras Reheating-Furnaces, of which the following is aspecification, for which I have applied for a patent in Great Britain,dated November 14, 1902, N0. 25,057.

For the purpose of reheatingingots, blooms, billets, and the like forrolling and hammering it has been proposed to employ regenerativegas-furnaces having one end of the hearth cold or comparatively cool andthe other end hot orvat the desired finishing heat. In such furnaces asat present constructed, however, it is found that if one end of the bedis cold or comparatively cool the regenerators are not heated regularlyor suficiently, with the result that the required temperature is notmaintained at the finishing end of the furnacebed.

The present invention consists in improvements in the construction ofregenerative gas reheating-furnaces by which in such furnaces theregenerators are heated regularly and sufficiently to maintain therequired temperature at the finishing end, while the other end mayalways be comparatively cool or even cold, so that ingots, blooms,billets, and the like can be continuously charged at the cold end andworked along gradually to the hot end, becoming heated on the way, untilat the eX- treme hot end they are drawn or pushed out at the desiredheat for rolling or hammering.

In the accompanying drawings, Figures 1 and 2 are respectively avertical longitudinal section and a sectional plan showing thearrangement of the hot-end part of the furnace and the means for heatingit consisting of an independent complete regenerative gas-furnace. Fig.3 is a sectional plan showing' the similar heating arrangements for thecooler part of the furnace-bed in front of the partition-wall. Fig. 4 isa diagrammatic sectional plan showing the general arrangement of acomplete furnace-bed constructed according to this invention, and Fig'.5 is a section on line 5 5 of Fig. 4. Figs. 6 and 7 are views similar toFigs. 4 and 5 of a modified construction 'of' furnace to suit two rowsof ingots. Fig. 8 shows a modified construction of the screenwall. Fig.9 is a part plan of amodified construction of the end furnace. Fig. IOis a vertical longitudinal section of a furnace similar.to Fig. 4. Figs.11 and l2 are cross-sections on lines 11 l1 and 12 l2 of Fig. 10, andFigs. 13 and 14 are diagrammatic sectional views of a furthermodification.

Referring' to Figs. I and 2, A is the part of the furnace in rear of thepartition-wall@ in which the ingots or billets are brought to theirfinishing heat and is in communication with the gas-producers B Bthrough the fiues C C and with the regenerators D D through the fines EE. Valves are provided for the control of the air and gas admitted andof the waste gases leaving' the furnace according to well-knownpractice. The result obtained is a U or horseshoe flame across the endof the heating-furnace reversible in direction, as represented by thearrow. l

In Fig. 3 a complete independent regenerative gas-furnace is shown bywhich is obtained a similar U fiame in the part F of the heating-furnacein front of the partition-wall, but directed lengthwise of the furnace.

Although, as shown in Figs. 1 to 3, provision is made for heating theregenerators alternately and reversing the direction of the flame, it isto be understood that sometimes when a lower finishing heatisvsuflicient the direction of each fiame may be continuous, theregenerators then being heated, as usual, in a continuous manner.

According to the construction of furnace shown in Figs. 4, 5, 10, 11,and 12 the transverse partition-wall e has an opening on the level ofthe furnace-bed just sufficiently large to allow the passage of a singleingot. The cold ingots are entered at the mouth t of the forward part ofthe heating-furnace and are gradually advanced, for example, by somemechanical device, such as a., into and through the horseshoe flame p,extending' between the flues from CZ to c, being thereby graduallyheated, thence through the passage in the wall e into the region of thefiamef, where it is brought to a finishing'heat and from IOO which it isejected through the opening g by any suitable means.

Fig's. 6 and 7 show a double :furnace of similar construction. In thiscase the partition- Wall may alternatively be built as shown intransverse section, Fig. 8. In each of these cases also the hot part ofthe furnace may be heated by a double continuous flame, as shown in thepart-sectional plan, Fig. 9.

As shown in Figs. l0, 11, and 12, the ingots preferably travel onwater-cooled tubes on the bed of the cooler part of the furnace, whichis also sloped to facilitate the transference of the ingots. 1t is to beunderstood that the bed of the furnace lshown in Figs. 6, 7, and 8 mayalso be provided with tubes and sloped.

Figs. 13 and 14 are respectively horizontal and vertical longitudinalsections of a furnace arranged for the heating-flames in the cooler partof the furnace to pass alternately from side /L to side and from side vlto side /L of the furnace.

Having thus described the nature of this invention and the best means Iknow of carrying'the same into practical effect, l claiml. Aregenerative gas reheating-furnace having primary and secondary chambersin communication with each other for the passage of billets, blooms orthe like from the primary to the secondary chamber, means whereby agas-flame is directed across one of said chambers above the bed thereofand bctween the ends of said bed, said flame being of agradually-increasing temperature from one end of said bed to the other,and means for heating the other furnace-chamber.

2. A furnace havingl primary and secondary chambers in communicationwith each other for the passage of billets, blooms or the like from oneto the other, means whereby a substantially U -shaped gas-flame isdirected across one of the chambers above and between the ends of thebed thereof, said flame being of gradually-increasing temperature fromone end of the bed to the other end, and means for heating the otherfurnace-chamber.

3. A furnace having a heating-chamber, and means whereby a substantiallyU-shaped gas-flame is directed across said chamber above its bed andbetween the ends of the latter, said flame being of gradually-increasingtemperature from the charging end to the finishing end of said chamber.

.In witness whereof I have hereunto set my hand in presence of twosubscribing witnesses.

FREDERICK siEMENs.

Titnessesz FRANZ RICHARD HERTEL, VERNEE F. SIEMENS.

